Talstar P would be your best general insecticide for your yard. It is labeled for just about any insect you could have a problem with including ants, roaches, beetles, mosquitoes, and many others. Talstar P can be used in a hose end sprayer but can be a little thick so may need a touch of water added to thin it a bit.
If you are looking to get rid of the weeds and grass so you can reseed you should use a glyphosate product such as Glyphosel Pro. This is a non-selective herbicide that will kill the weeds and anything other foliage it is sprayed on. You can reseed after 14 days. Do not directly spray the trees or allow drift to get on the trees to avoid damage.
Yes. Talstar P can be safely used around pets as long as you follow the label instructions; all pets need to be out of the area while application is being made and they can return as soon as the application is dry. Talstar P will kill scorpions indoors and outdoors, but our most popular scorpion products are Demon WP and Cy-Kick CS. Both of these products will stay up on the surface of whatever material you are spraying, making the insecticide more available for the scorpion to come in contact with it. All of the insecticides on our site are safe to use around pets (unless otherwise noted) as long as you follow the product label.
A product like Talstar P can be used to control midges (another term for blind mosquitoes) outdoors.